|
700/900 Series General Forum for the Volvo 740, 760, 780, 940, 960 & S/V90 cars |
![]() |
|
Vibration increase, particularly at idle…any ideas?Views : 2570 Replies : 30Users Viewing This Thread : |
![]() |
|
Thread Tools | Display Modes |
|
![]() |
#1 |
Ye olde Volvii galore!
Last Online: Jun 5th, 2024 15:52
Join Date: Oct 2017
Location: Sherborne
|
![]()
Hi all,
I’ve noticed in the last few days that I’m feeling more vibration than usual at idle in my diesel 940. Obviously the D24 isn’t the smoothest engine in the world anyway (as much as I love mine!) but it definitely feels a bit different to usual. In the last couple of weeks I’ve done the following: Changed from 10w40 semi synthetic to 5w40 fully synthetic Fitted replacement rear box exhaust hanger rubbers (same size as the old disintegrating hoops, but the rectangular box style design) Changed from 185/65/15 tyres to 195/65/15. Obviously it’s unlikely that the tyres will have affected anything, but does anyone know if the oil change may have done? It was very happy on fully synth for the first week, and is still running well, just with the added vibrations. Any advice most gratefully received! Phil
__________________
Barges of Distinction: '96 945 SE LPT M90 '95 945 GLE D24TIC M90 ‘88 745 GL B200E M47 |
![]() |
![]() |
The Following 2 Users Say Thank You to AllHailKingVolvo For This Useful Post: |
![]() |
#2 |
VOC Member
Last Online: Today 11:29
Join Date: Feb 2008
Location: Gloucester
|
![]()
I shouldn’t have thought the weight of the oil would make much difference. 5w-40 and 10w-40 are supposed to be the same weight once hot. The 5w oil should flow better when cold, but so long as it isn’t leaking out I shouldn’t have thought that would be a problem.
Were the old and new oils the same brand? Unless you somehow extracted all the 10w-40 you will now have a mixture of the two. They are probably, but not necessarily, compatible. If it were me I’d check the exhaust first. Not only are they often the source of strange noises but it should be the easiest thing to examine. |
![]() |
![]() |
The Following 2 Users Say Thank You to Forrest For This Useful Post: |
![]() |
#3 | |
Ye olde Volvii galore!
Last Online: Jun 5th, 2024 15:52
Join Date: Oct 2017
Location: Sherborne
|
![]() Quote:
Oil wise they weren’t the same brand but appear to be compatible. Both are specced to A3/B4 and VW 505-00. The car isn’t losing oil (it never seems to burn any, despite being just shy of 300k miles!) which was my primary concern with switching to 5w. Pressure comes up quickly and the car doesn’t appear to be down on power or ailing. I’ll likely do another change with the fully synthetic 2k in which should hopefully flush out the last of any remaining semi.
__________________
Barges of Distinction: '96 945 SE LPT M90 '95 945 GLE D24TIC M90 ‘88 745 GL B200E M47 |
|
![]() |
![]() |
The Following User Says Thank You to AllHailKingVolvo For This Useful Post: |
![]() |
#4 |
VOC Member
Last Online: May 3rd, 2024 14:15
Join Date: Dec 2006
Location: stoke on trent
|
![]()
hi phil
if the problem is not the exhaust put a post on the D24.com web site . they have some guys who specialise in this engine hopefully give you some pointers , there are guys on our 900 forum too so hope you get it sorted its really something i don't know about . |
![]() |
![]() |
The Following 2 Users Say Thank You to jpliddy For This Useful Post: |
![]() |
#5 |
Premier Member
Last Online: Today 08:38
Join Date: May 2012
Location: Lakenheath
|
![]()
Early D24s had solid valve lifters and later cars had hydraulic lifters Phil, i'm not sure when they changed. My first thought would be one or more of the hydraulic lifters is "bleeding down" at idle due to the slightly thinner oil.
It's also possible the new oil has dislodged some dirt that was maintaining oil pressure in the suspect lifters and they are now a bit dirty and as such not operating fully at idle/lower oil pressures. I'd be inclined to switch back to the 10W40 semi-synth and before you top up to the correct level, add ~0.5L synthetic ATF such as Carlube ATF-U, NAPA MVA or similar. This will help clean the hydraulic lifters if yours has them, clean the valves and piston rings to help prevent them sticking, revive the rubber seals in the engine etc. You could also have dirt in the fuel system causing a partial misfire at idle, try adding some of this, it's reputed to do a good job on diseasels : https://www.halfords.com/motoring/en...ml-264671.html Many moons ago i used some on my n/asp Ranger 2.5D (Ford-badged Mazda B2500) after an advisory on the MoT about it being smoky - cleaned the exhaust a treat, improved power and economy. Others on here have used it more recently in newer Volvos to geat effect as well.
__________________
Cheers Dave Next Door to Top-Gun with a Honda CR-V & S Type Jag ![]() |
![]() |
![]() |
The Following 2 Users Say Thank You to Laird Scooby For This Useful Post: |
![]() |
#6 |
Senior Member
Last Online: Yesterday 07:36
Join Date: Jul 2019
Location: Stoke on trent
|
![]()
Hydraulic lifters were introduced in 1993 with other service engine modifications ie different waterproof, added bet tensioner.egr,catalic converter.timing setup,different size cambelt ,plus few other changes
|
![]() |
![]() |
The Following 2 Users Say Thank You to J liddy For This Useful Post: |
![]() |
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests) | |
|
|